package com.example.local;

import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author YAO
 * @create 2021-05-13 20:59
 */
public class ThreadLocalTest {

    //线程安全的map
//    public final static Map<String,Object> data = new ConcurrentHashMap<>();
    public static ThreadLocal<Object> threadLocal = new ThreadLocal<>();
    private static Random random = new Random();

    public static class Task implements Runnable{

        @Override
        public void run() {
            //在run方法中随机生成一个变量（线程要关联的数据），然后以当前线程名为key,保存到map中
            Integer i = random.nextInt(1000);
            //获取当前线程名
            String name = Thread.currentThread().getName();
            System.out.println("线程[" + name + "]生成的随机数是：" + i);
//            data.put(name,i);
            threadLocal.set(i);
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            new OrderService().createOrder();
            new OrderDao().saveOrder();
            //在Run方法快结束之前，以当前线程名获取出数据并打印，查看是否可以取出操作
//            Object o = data.get(name);
            Object o = threadLocal.get();
            System.out.println("在线程[" + name + "]快结束时取出关联的数据是：" + o);
        }
    }


    public static void main(String[] args) {
        for (int i = 0; i < 3; i++) {
            new Thread(new Task()).start();
        }
    }

}
